Calgary, Alberta weather in September

Historical temperature average in September

In Calgary, Alberta, Canada
66°F
highs
42°F
lows
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General weather summary

Moderately chilly with a gentle breeze
Feels like
20%
Chance of rain
0.077 in
Amount
11.9 mph
Wind speed
66%
Humidity
12.7 hrs
Daylight length
7:10 AM
Sunrise
7:51 PM
Sunset
50%
Cloud cover
Sweater
What to wear
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Table of contents

What is the average temperature in September

The average temperature in Calgary in September for a typical day ranges from a high of 66°F (19°C) to a low of 42°F (5°C). Some would describe it as moderately chilly with a gentle breeze.

For comparison, the hottest month in Calgary, August, has days with highs of 76°F (25°C) and lows of 50°F (10°C). The coldest month, February has days with highs of 30°F (-1°C) and lows of 11°F (-12°C). This graph shows how an average day looks like in Calgary in September based on historical data.

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Highs and lows in Calgary in Sep

How much does it rain or snow in September

In Calgary in September, there's a 20% chance of rain or snow on an average day. And on the average day it rains or snows, we get 0.38 in (9.6 mm) of precipitation. In more common terms of how much that is, some would describe it as flurries.

The wettest month in Calgary is June where a typical day has a 38% chance of precipitation and gets 0.10 inches (2.4 mm) of precipitation, while the dryest month in Calgary is February where a typical day has a 10% chance of precipitation and gets 0.07 inches (1.8 mm) of precipitation. These graphs show the probability of it raining/snowing in September and the amount of rainfall.

Chance of rain or snow on an average Calgary day by month
Average precipitation by hour of day
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How cloudy is Calgary in September

The average amount of time that the sky is clear or sunny (partly cloudy or less) in Calgary during September is 11.9 hours (50% of the day). For comparison, the month with the most clear, sunny days in Calgary is July with an average of 14.7 hours per day while January has the shortest amount of cloud-free hours with only 8.0 hours per day. This graph shows the average amount of sunshine in Calgary in September based on historical data.
Monthly clear skies percent of time in Calgary

When is sunrise and sunset in September

The average day in Calgary during September has 12.7 hours of daylight, with sunrise at 7:10 AM and sunset at 7:51 PM.

The day with the longest amount of daylight in Calgary is June 20th with 16.6 hours while December 20th has the shortest amount of daylight with only 7.9 hours.

This graph shows the average amount of daylight in Calgary in September based on historical data.

Average hours of daylight in Calgary by month

How humid is it in September

In September, Calgary is moderately humid with an average amount of 66% (relative humidity), which could be described as humid but cool. January has the highest relative humidity at 88% and is the least humid in August at 62%. This graph shows the average amount of humidity in Calgary throughout September based on historical data.
Average relative humidity in Calgary by month

How windy is it in September

Historically, the wind in Calgary during September blows at an average speed of 11.9 mph (19.1 kph). The windiest month is January with an average wind speed of 16.4 mph (26.3 kph), while the calmest month is August with an average wind speed of 10.7 mph (17.3 kph). This graph shows the average wind speed in Calgary in September based on historical data.
Average monthly wind speed in Calgary

What to wear in September

With an average high of 66°F (19°C) and a low of 42°F (5°C), it generally feels moderately chilly with a gentle breeze. With that in mind, most people would dress in something moderately warm like a sweater
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What's the weather like in Calgary the rest of the year

We've collected the weather data for Calgary during all other months of the year too:

Where does this data come from

Weather data for Calgary was collected from the MERRA-2 project from NASA, which used a climate model combined with historical data from weather stations around the world to estimate what the conditions were like for every point on the Earth.

For all data based on historical data, we've averaged the data from the past 11 years (2010-2020). For example, for the hourly temperature at 10am, we've looked at the temperature at 10am on every day in September (e.g., September 1, September 2, etc. in 2010, 2011, etc.) and took the arithmetic mean. We did not smooth the data, so for example, our daily temperature line will have some randomness due to the fact that weather is random in the first place.

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